How to run Unix command with Pipe ( | )?

Question

Dear Friends,
I have to execute the below unix command through java program.
*ps -ewwo pid,args | grep -E "abc.sh|xyz.jar" | gawk '{ print $1 }' | wc -l*
My code to execute this command is,
Runtime run = Runtime.getRuntime();
File workDir = new File("/root/sat");
String psCmd = "ps -ewwo pid,args | grep -E \"abc.sh|xyz.jar \" | gawk '{ print $1 }' | wc -l";
Process process = run.exec(psCmd, null, workDir);
          String line;
          int i = process.waitFor() ;
          if(i == 0) {
          BufferedReader buf = new BufferedReader( new InputStreamReader( process.getInputStream() ) ) ;
          while ( ( line = buf.readLine() ) != null )
               System.out.println("Line - ["+line+"]") ;
          } else {
               BufferedReader stdErr = new BufferedReader(new InputStreamReader(process.getErrorStream()));
               // read the output from the command
               while ((line = stdErr.readLine()) != null) {
               System.out.println(line);
               }When i execute this command, i'm getting output as,
ERROR: Garbage option.
When i analyse the above error, i found that, the PIPE ( | ) command is not supported through java.
Could anyone please help me how to execute the above unix command (with | ) in java?
Thanks in advance,
Sathish

Answer 1

The pipe has to be interpreted by a shell so you need
String[] psCmd =
    "sh",
    "-c"
    "ps -ewwo pid,args | grep -E \"abc.sh|xyz.jar \" | gawk '{ print $1 }' | wc -l"
Process process = run.exec(psCmd, null, workDir);You should also read, re-read and then implement the recommendations in the 4 sections of http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html .